Armchair



FIG. 1 is a perspective view of the left, top, and front sides of the armchair according to our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a back view thereof; and,

FIG. 8 is a perspective view of the left, top, and front sides of the armchair in a reclined position according to our new design.

The broken lines shown in the drawings represent portions of a armchair that form no part of the claimed design. 

CLAIM The ornamental design for a armchair, as shown and described. 